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North of London | Sounds like you have a good site location on a hill and not deep in the ground. That has to go a long way.
Now it might depend on your soil and ground water level.
We put an addition on our 130 year old house about 20 years ago and in Ontario, building code requires a 'membrane' on the outside wall.
So our walls were 'painted' by hand with the usual black tarry stuff then a plastic dimpled membrane was attached like is shown at this site
http://www.superseal.ca/dimpledmembrane.html
Not sure what brand we used but a google turned up this site which looked like what we used.
It allows any water to flow down the outside of the wall to the crushed stone and drain around the footing.
That way you do not get ponding against the wall and pressure to drive the water in.
They would not allow a connection to a field tile (although we did this after) but the crushed stone and drain tiles around the outside is connected by a drain to the inside under the concrete floor and all depth of the footing is filled with crushed stone under the concrete.
A sump pump is a requirement to remove excess water.
The only problem we had was our clay ground settled and dragged the membrane down with it in some places so it is 6-8 inches below grade where it is supposed to be flush with grade.
there is also another material which looks like a fibre board that does the same and is often used in contracted houses because it is easier and faster to put up therefore less labour cost.
Because we matched floor level with the old house and then went for 8 foot high walls our basement floor is a full 5 foot below grade and we have never had a flood but the sump pump is running today after our 60-70 mm of rain we have had this week.
Doing it yourself?
That is what we did too.
Good learning if you have a few of the basics and an understanding building inspector, ours was good, gave us some tips and kind of overlooked a couple of things because we were doing it ourselves.
Have fun and enjoy the new house.
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Waterproof basement walls
